巷道围岩塑性区的德鲁克-普拉格准则解

Solution of D-P Criterion of Plastic District of Surrounding Rock of Roadway

考虑到巷道围岩屈服与中间主应力有关,运用德鲁克-普拉格准则推出了圆形巷道塑性区半径及应力的解析解。结果表明,在考虑中间主应力的情况下巷道围岩塑性区增大,证明中间主应力对塑性区具有一定影响。因此,该理论成果弥补了以往理论未考虑中间主应力的不足,也为巷道围岩塑性区的理论分析提供了一种新的理论计算方法。

Considering that the yield of surrounding rock of roadway is related to the middle principal stress, the analytic formula for radius of plastic district and stress of round roadway have been put out by adopting the Druker-Prager criterion. The result shows that the plastic area radius of surrounding rock of roadway increases after taking account of the middle principal stress, it is proved that the middle principal stress has a certain influence to the plastic district. So this theoretical formulation is the complement of the past theoretical achievement, and has offered a kind of new method for theoretical calculation of plastic area of surrounding rock of roadway.